Ladder jack



l r a drawing, accompanying and forming part Patented Dec. 6, 1927.

nitup'rrn *ST ES Marianna.nannyor-woonnrngrnnnsynvn mn,

niannzen JAGK. f l

application firearm-my Ellie object roof any present intention is U provision of a ladder-jack qaossessed of the capacity erfstrongly .andsafely supporting 4 V pedestalyii rth'ait ris-ifixedly connected at IB 60 v a aladder zand this iirrespeotive of whether or nflt :the support 3011 which ithe :base of the deck iis-ito be superposed is horizontal :or {is inclined. The invention also v,contemplates the prouision of ca ladder-jack readily ad- ,iusttible {:to ladders of different Width and susceptible :of being readily applied to and disassooiated IEBODlf-clllflddfil. f

, Other objects and practicaLad-vantagesof the {invention will:.1b e fully understood from the followingdescription and claims when the same :are read in reconnect-ion with the of :this specification, tin WlliCl1i2-- .F igurell is'xa viewppa-rtlyiin elevation :and

partly in section, FShOWlIlg-tfi jack iofuny ,ziir xtention ascolnblned wither ladder. Figure :2 is ;a detail :elewati on :taken from a view pointsatthe *leftbtf Figure 1.

' figure 7:3 a wiew in ielevation sshowing the 1111311151151 which any :nonel ,ja'cksis emplayed to support 114 ladder when it is nec- 1 essany L130 superposeithe base of the jack on an inclined :srrpportrsnch,ffor iinstanne,

as inclined portion ;ofground.

Figure 4 )lS n :detziil :planwview of the plate positiavely illustrating the I lon'gatudmal rislot' 22 Itlierein; i

Similar numerals of reference designate corresponding parts in all the views of the drawing. v I

The ladderillustrated is of the ordinary well known construction in that it comprises side stiles 1 and rungs 2. I prefer, however, to provide the stiles 1 with transverse apertures adjacent to the lower ends thereof for'the reception of the shanks of the bolts 8 hereinafter referred to.

Among other elements my novel 3' ack comprises a socket member 4, and a socket member 5, the said socket members being adapted to receive the lower ends of the stiles 1 and being preferably, though not necessarily,

connected to the stiles through the medium of the transverse bolts 3.

The socket member 5 is provided with spaced front flanges 6 between-which are mounted a spur gear 7 and a gravitational pawl 8. It will also be noted that a vertical rack bar 9 'is guided between the front flanges 6 in position tomesh with the gear 7.

' The socket member 4 isfprovided at its lower end with a ball extension 10, and the 6, 927 iseriai miniseries. 1

Tack be? 9 p o d atitl'sinwtmnd" a do all extnnslionbr terminal 11d. ball sion 1O,=.1s:%d1sposie:d in a '.k 31a [0111a to tt-he arpper side am ibase;*14.- 'llhe :sodket 1-5. maniplementary to the ball extension 1-1 ,Again ,it wi ll be appreciated that 110f; wuthstandin g the positioning of the base 14; Y

the ladderunay be arrangetbto restverticall y; 7

rk staiice 1f the 'suppor t- 'on -w1neh-the base 14 11s superposed 'incli'nedIfronnthe horizontal, the-"rack bar "Q may' be extended beyond the lower' encliofjthe'socket member 5', after the manner illustrated Figu'refZ-B, the gravitational pawl 8 by eooperation with the spur gear 7 in' mesh with the rack bar T 9 .averting the, possibility of "the socket mom 7 her 5 and the portionofthe ladtler'carri'ed by the same inadvertently moving downwardly. In this connection, it will further. I

be appreciated that because of-the described 2 relative arrangement of the gear 7, rack 9 ii 7 and pawl 8, the gear 7 will be permitted to turn when the rack bar 9 is moved longitw' dinally upward. V i It will be understood Figures 1 and 2,'that thebase 14= is chambered as designated by 21'and the plate 20 1s longitudinally slotted alongside the longitu I dinal series of apertures 19, the slot designated by 22, Figures 2 and 4c', being'designed forthe reception and movement of an: chor shank 23 pendent fromthe plate 17 and provided with a T-head asdesignated by 2 1 to prevent upward "movementof'the plate 1 17 on the plate 20. The head-24 is prefer,- ably so disposed that it may be dropped through the slot 22 and then on turning of the plate 17 aboutits center, the head 24: will be disposedoatan angle tothe length of the o slot 22, Figures 2 and 4, and at the same 17 with respect to the plate 20 is positioned 1 10 time the pin for adjustably fixing the plate ladder and as readily adjusted to suit dif-- i. ferent conditions.

I have entered into :a detailed description of the construction and relative arrange ment of the"partscomprised-in the'present andpreferred embodiment of my invention inorder to impart a full, clear, and exact understanding of thesaid embodiment. I do not desire, however,,to be understood as limiting myself 'to' the preciseconstruction 7 and arrangement of parts disclosed, my in- 7 tion.

vention being defined byi'ny appended claims r within the scope of which modifications may be made without departure from my inven Having thus described the-invention, what I claim is 1. A ladder jack comprising a base, a member adapted to engage one side portion of a ladder, a ball and-socket connection between the base and said member, a rack bar,

a ball and socket joint between said rack 'bar and the base, and a second member adapted to engage the side portion of the ladder and receiving the rack bar and having a gear in mesh with therack bar and also having a pawl tocooperate with said gear; the lower section of the ball and socket joint between the base and the rack bar be-v ingadjustable in the direction ofthe length ot the-base and equipped for adjustable connection to, the base. i

2. In a ladder jack and in combination a chambered base, a slotted and apertured plate arranged over said chamber of the base and carried by the base, a member connected with the base and adapted to engage one side portion of a ladder, a rack bar, a ball and socket connection between said rack bar and the base, the lower section of said the slot of the first named plate and the'head of which is disposed below said first named connection having a plate superposed on the plate, a pin for adjustably fixing the'lower section of theball and socket connectionto the plate, and a second member adapted to engage onesideportion of a ladder and re} ceiving the rack bar and equipped with a spur gear in'mesh with the rack barand also equipped with a pawl for cooperation with said spur gear.

3. A ladder jack comprising a base, a socket member connected-with the base and adapted to receive the lower end of one side stile of a ladder, a rack spaced from said socket member, a connection between said rack and the base, a second socket'member adapted to receive the lower end of the other stile of a. ladder and receiving the rack, a spur gear carried by the second named socket member and meshed with the rack, and a pawl carried by the second named-socket member and arranged in engagement with said spur gear; the connection between the MATHIEU JILBAUR. j

y In testimony whereof I aflix my signature; r 

